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The usually ungenerous Mel Cooley (Richard Deacon) invites Rob (Dick Van Dyke), Laura (Mary Tyler Moore), Buddy (Morey Amsterdam), and Sally (Rose Marie) to spend a weekend at a fishing lodge -- only he forgets to make reservations. As a result, the gang is billeted at a vacant lakeside cabin, which, according to the somewhat sinister caretaker, happens to be haunted! Naturally, the foursome doesn't believe such nonsense, until strange things begin to happen. The best line in this chillingly hilarious episode is uttered by Rob: "Buddy, will you stop acting like Lou Costello and come to bed?"